Diamond



FIG. 1 is a top plan view of a diamond showing my new design;

FIG. 2 is a side elevational view taken along an intersection between adjacent points of a star with similar intersections of the star being identical thereto;

FIG. 3 is a side elevational view taken along a point of the star with similar points of the star being identical thereto; and,

FIG. 4 is a bottom plan view. 

The ornamental design for a diamond, as shown and described. 